Filters: Tags: Aerial (X) > Types: OGC WMS Layer (X) > partyWithName: James W Vallance (X)

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Slides of the July 22, 1980 eruption of Mount St. Helens. Skamania County, Washington. 1980. These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slide no. 43 through no. 62 show the third eruptive pulse. this sequence was taken while moving clockwise from the west to the north side of the mountain at a distance of 7 to 10 miles and at an elevation of 17,000 feet. View of eruption between 19:04 and 19:05. Skamania County, Washington. (Photo by J. Vallance, USGS) Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Photographers, Skamania County, Washington, Vallance, J.W. Collection, Volcanoes, All tags... aerial, color transparency (slides), Fewer tags Slides of the July 22, 1980 eruption of Mount St. Helens. Skamania County, Washington. 1980. These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slide no. 43 through no. 62 show the third eruptive pulse. this sequence was taken while moving clockwise from the west to the north side of the mountain at a distance of 7 to 10 miles and at an elevation of 17,000 feet. View of eruption at 19:01, the pyroclastic flow front extends underneath the cloud layer. Skamania County, Washington. (Photo by J. Vallance, USGS) Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Photographers, Skamania County, Washington, Vallance, J.W. Collection, Volcanoes, All tags... aerial, color transparency (slides), Fewer tags Slides of the July 22, 1980 eruption of Mount St. Helens. Skamania County, Washington. 1980. These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slides 28 through 37 show second eruptive pulse. This sequence was taken while moving counter-clockwise from the southwest to the south side of the mountain at a distance of 7 to 10 miles and while changing elevation from 12,000 to 15,000 feet. Note the bicolored appearance of the plume: the lighter portion is the ask cloud rising from the pyroclastic flows. View of eruption... Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Photographers, Skamania County, Washington, Vallance, J.W. Collection, Volcanoes, All tags... aerial, color transparency (slides), Fewer tags